again after the discharge pressure decreases to 460 psig. NOTE: When the switch opens and then closes, there will be a 3 minute short cycling delay before the outdoor unit will energize.Under normal conditions the switch is closed.
Comfort AlertTM Diagnostics Module
The Comfort AlertTM Diagnostics Module is a breakthrough innovation for troubleshooting heat pump and air conditioning system failures. The module installs easily in the electrical box of the outdoor unit near the compressor contactor. By monitoring and analyzing data from the Copeland scroll compressor and the thermostat demand, the module can accurately detect the cause of electrical and system related failures without any sensors. A fl ashing LED indicator communicates the ALERT code and a diagnostic key is also imprinted on the side of the module to quickly direct the technician to the root cause of a problem. See Figure 3.
NOTE: This module does not provide safety protection! The Comfort AlertTM Diagnostics Module is a monitoring device and cannot control or shut down other devices.
24 VAC Power Wiring
The Comfort AlertTM module requires a constant nominal 24VAC power supply.The module cannot be powered by the C terminal on a defrost board or other control board without experiencing nuisance alerts.NOTE:The wiring to the module’s R & C terminals must be routed directly from the indoor unit or thermostat.
If the constant 24 VAC (R wire) is not present in the outdoor unit, use one of the spare wires in the thermostat cable to bring power to the module. Connect the other end of the spare wire to R at the indoor unit or thermostat.
Thermostat Demand Wiring
The Comfort AlertTM module requires a thermostat demand signal to operate properly. The thermostat demand signal input (labeled Y on the module), should always be connected to the compressor contactor coil. NOTE: When the coil is energized, the demand signal input is 24 VAC.When the coil is not energized, the demand signal input should be less than 0.5 VAC.
NOTES:
•Factory installed modules have different thermostat demand signal wiring. Always follow manufacturer wiring instructions when replacing the module.
•After the thermostat demand signal is connected, verify that 24 VAC across Y & C when demand is present.
Interpreting the Diagnostic LED’s
When an abnormal system condition occurs, the Comfort AlertTM module displays the appropriate ALERT and/or TRIP LED will fl ash a number of times consecutively, pause and then repeat the process.To identify a Flash Code number, count the number of consecutive fl ashes.
Each time the module powers up, the last ALERT Flash Code that occurred prior to shut down is displayed for one minute. The module will continue to display the LED until the condition returns to normal or if 24 VAC power is removed from the module.
LED Description
•POWER LED (Green): indicates voltage is present at the power connection of the module.
•ALERT LED (Yellow): communicates an abnormal system condition through a unique fl ash code. NOTE: The ALERT LED will fl ash consecutively, pause and then repeat the process. The number of consecutive fl ashes, referred to as the Flash Code, correlates to a particular abnormal condition. Detailed descriptions of these ALERT Flash Codes are listed in Table 4 (page 14).
•TRIP LED (Red): indicates a demand signal is received from the thermostat, but current to the compressor is not detected by the module. The TRIP LED typically indicates if the compressor protector is open or the compressor has no power.
The scroll compressor’s R (run), C (common), and S (start) wires are routed through the holes in the Comfort AlertTM module marked R, C, and S.
NOTE: The common wire does not need to be routed through the module for it to operate.
POWER LED
(Green)
Diagnostics
Key
ALERT LED
(Yellow)
TRIP LED
(Red)
Figure 3. Comfort AlertTM Diagnostics
Module
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